Furnace-grate



(No Model.)

B. S, NIEBELL.

FURNACE GRATE.

No. 270.100, Patented Jan. 2, 1883 N. FUERxPhvlmLihographan Washinglnn. u. c.

. UNITED STATES PATENT OFFICE.

, BERNHARD VNIEBELL, or SGRANTON, PENFSYLVANIA. I

FURNACE-GRATE.

SPECIFICATION forming part of Letters Patent No. 270,100, dated January 2, 1853.

To all whom t't may concern:

Be it known that I, BERNHARD S.N1EBELL, of Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Furnace- Grates, and I do hereby declare the following to be a full, clear, and exact description of the same, reference being bad to the accompanying drawings, forming partofthisspecificatiou, in which Figure l is a top plan view of a furnacegrate constructed in accordance with my invention. Fig. 2 is a longitudinal vertical section of the same, taken on-the line at wof Fig. 1. Fig. 3is a cross-sectional view taken on the line y y of Fig 1, and Fig. 4 is a detail view of a modification. p

Similar letters of reference in the several figures denote the same parts.

Myinvention relates to that class of furnace-p grates in which the rigid bars of the grate are alternated with movable rocking sections which operate to stir and' break up the fuel on the grate and keep it free of ashes, cliukers, and other. obstructions to proper combustion and my invention consists in certain novel improvements, which I will first describe and then point out particularly in the claims at the end of this specification.

Referring to the accompanying drawings, A A represent a series of stationary sections, preferably four or more in number, of which the grate isin part composed. Each of these sections preferably consists oflon gitndinal bars a and cross-bars b, all formed in a single castin g, and the several sections are fitted together so as to extend over the bottom of theiurnace from wall to wall, as shown.

In the spaces between the bars of the sta-' tionary grate-sections I arrange a series of rockers or agitators, B. These rockers B are preferably of T shape, as shown, their upper horizontal portions, 0, lying normally flush with the top of the stationary grate-sections,

while their depending portion 01 extends down and is secured to asuitable connecting-bar, O.

Heretofore in grates of this class the rockers or agitators haveeither been mounted on separate shafts extending transversely of the furnace below the grate and supported by the furmace-walls, or else the stationary bars have been Application filed November 23, 1882. (No model.)

grate of the second class is, that when it is desirable from any cause to remove one or more of the rockers, the whole grate, ora whole section thereof, has to be pulled out before the result can be effected, because the songs on the stationary bars are rigidly attached to said bars and the makers cannot be removed without taking out the bars and thenseparating them. To obviate the objections to these prior forms of grates, I, in my present structure, mount my rockers upon removable rods or bolts extending transversely through perforations in the stationary grate-bars, and by i this means I am enabled to support the crossrods at short intervals, and thus obviate the difficulty of warping, while atthe same time, by the removability of the rods, render it feasible to take out one or any number ofrockers without disturbing at all the stationary sections. rockers so as to break joints-thatis to say, I locate the rockers upon a given cross bolt or shaft in every other space, the rockers on the next shaft projecting into the intervening spaces, as shown in Fig. 1.

Those rockers which are locatedat the end of thefurnace are made halfT-shape, as shown in Fig. 2; but in cases where, from the structure of the furnace, there would notbe room enough at the end to permit of the motion of a rocker, the stationary grate-section may be provided with an inwardly-projecting supplemental bar, 0, as shown in Fig. 4. The lower ends of the rockers on each cross-boltare connected to each other by a cross-bolt, f, and the latter in turn are attached to the connecting rod or rods 0, attached to the operating-handle H. By operating the handle H back and forth the ends of the rockers are projected alternately above the stationary grate-bars and operate to disturb the material supported over the whole area of the fu rnac'e, effectually break- By preference I also arrange the;

IOO

ing. up and removing ashes, cinders, 850., and keeping the fire Well supplied with air throughout the furnace-bed. To assist in the breaking up of accumulations on the grate, I preferably form knife-edges k on the under side of the rocker-tops, as shown in Figs. 2' and 3, and when the rockers are worked these knifeedges cut through such accumulations and rapidly remove them.

My grate is especially adapted'to furnaces which burn culm or fine coal, and-I find by practice that for such uses itis desirable-to make the open spaces between the stationary bars of the grate and the rockers about equal to'the thickness of the said rockers and stationary barsthat is to say, where the rockers and bars are each three-eighths inch wide I leave a three-eighths inch space.

There larger fuel is burned the relative widths of the bar and space can be altered to suit circumstances.

I am aware that prior to my invention furnace-grates have been made consisting of rock- -.iing sections mounted upon cross-shafts, with the bars of the sections projecting into the spaces between the bars on the adjoining sections; but in such grates no stationary gratebars are employed, and when the rocking sections are rocked large openings are formed,

joining sections, in connection with stationary grate-bars, not only is the mass on the grate enabled to be disturbed throughout when the rocking sections are oscillated, but while such disturbance is taking place the body of the a bars and so as to breakjoints with each other,

substantially as described.

2. In a furnace-grate, the combination,with stationary grate-bars, of rockers whose upper faces lie normally flush with the upper faces of the stationary bars, mounted upon removable cross rods or bolts, passed transversely through perforations in the stationary bars, substantially as described, for the purpose specified.

3. In a furnace-grate, the combination,with the stationary grate-bars, of the pivoted rockers having the k nife-edges on their underside, substantially as described,- for the purpose specified.

' BERNHARD S. NIEBELL.

Witnesses:

T. B. HOWE, A. H. LEE. 

